<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>state</title>
  </head>
  <body>
    <!-- 准备好一个容器 -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script src="../js/react.development.js"></script>

    <!-- 引入react-dom用于支持react操作DOM  -->
    <script src="../js/react-dom.development.js"></script>

    <!-- 引用bable,用于将jsx转为js -->
    <script src="../js/babel.min.js"></script>

    <script type="text/babel">
      // 1.创建组件
      class Weather extends React.Component {
        // 初始化状态
        state = { isHot: true }

        render() {
          return (
            <h1 onClick={this.changeWeather}>
              今天天气很{this.state.isHot ? '炎热' : '凉爽'}
            </h1>
          )
        }

        // 自定义方法要用赋值语句的形式+箭头函数
        changeWeather = () => {
          // 通过setState接口来修改状态值
          this.setState({ isHot: !this.state.isHot })
          console.log(this.state.isHot)
        }
      }

      // 2.渲染组件到页面
      ReactDOM.render(<Weather />, document.getElementById('test'))
    </script>
  </body>
</html>
